a-a a-b a-c aaa aab aac aae aah aau ab- aba abb abc abe abh abu ac- aca acb acc ace ach acu aea aeb aec aee aeh aeu aha ahb ahc ahe ahh ahu au- aua aub auc aue auh b-u baa bab bac bae bah bau bba bbb bbc bbe bbh bbu bca bcb bcc bce bch bcu be- bea beb bec bee beh beu bha bhb bhc bhe bhh bhu bua bub buc bue buh buu c-- caa cab cac cae cah cau cba cbb cbc cbe cbh cbu cca ccb ccc cce cch ccu ce- cea ceb cec cee ceh ceu ch- cha chb chc che chh chu cua cub cuc cue cuh cuu eaa eab eac eae eah eau eba ebb ebc ebe ebh ebu ec- eca ecb ecc ece ech ecu eea eeb eec eee eha ehb ehc ehe ehh ehu eu- eua eub euc eue haa hab hac hae hah hau hba hbb hbc hbe hbh hbu hca hcb hcc hce hch he- hea heb hec hee heh heu hha hhb hhc hhe hhh hhu hua hub huc hue huh huu ua- uaa uab uac uae uah uau uba ubb ubc ube ubh ubu uca ucb ucc uce uch ucu uea ueb uec uee ueh uha uhb uhc uhe uhh uhu uua uuc uue uuu